Under what circumstances do central and local party actors engage in gatekeeping to influence the outcomes of local nomination races? In this article, I develop a theory of gatekeeping in Canadian parties by synthesizing past work on candidate selection with a multi-method field study of New Brunswick provincial nominations (2017–2018). I present evidence in favour of this theory from participant-observation of 25 nominating conventions, 93 elite interviews, and an original dataset of major party nominations for the 2018 New Brunswick election. The theory and evidence show how gatekeeping by central party actors helps explain how nominations can go uncontested, even in competitive and safe seats. The theory also generates several testable claims for future studies of candidate selection in other places, time periods and levels of government in Canada.
